wp-content/plugins/akismet/class.akismet.php

   1 <?php
   2
   3 class Akismet {
   4         const API_HOST = 'rest.akismet.com';
   5         const API_PORT = 80;
   6         const MAX_DELAY_BEFORE_MODERATION_EMAIL = 86400; // One day in seconds
   7
   8         private static $last_comment = '';
   9         private static $initiated = false;
  10         private static $prevent_moderation_email_for_these_comments = array();
  11         private static $last_comment_result = null;
  12         private static $comment_as_submitted_allowed_keys = array( 'blog' => '', 'blog_charset' => '', 'blog_lang' => '', 'blog_ua' => '', 'comment_agent' => '', 'comment_author' => '', 'comment_author_IP' => '', 'comment_author_email' => '', 'comment_author_url' => '', 'comment_content' => '', 'comment_date_gmt' => '', 'comment_tags' => '', 'comment_type' => '', 'guid' => '', 'is_test' => '', 'permalink' => '', 'reporter' => '', 'site_domain' => '', 'submit_referer' => '', 'submit_uri' => '', 'user_ID' => '', 'user_agent' => '', 'user_id' => '', 'user_ip' => '' );
  13
  14         public static function init() {
  15                 if ( ! self::$initiated ) {
  16                         self::init_hooks();
  17                 }
  18         }
  19
  20         /**
  21          * Initializes WordPress hooks
  22          */
  23         private static function init_hooks() {
  24                 self::$initiated = true;
  25
  26                 add_action( 'wp_insert_comment', array( 'Akismet', 'auto_check_update_meta' ), 10, 2 );
  27                 add_filter( 'preprocess_comment', array( 'Akismet', 'auto_check_comment' ), 1 );
  28                 add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments' ) );
  29                 add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments_meta' ) );
  30                 add_action( 'akismet_schedule_cron_recheck', array( 'Akismet', 'cron_recheck' ) );
  31
  32                 $akismet_comment_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
  33
  34                 if ( $akismet_comment_nonce_option == 'true' || $akismet_comment_nonce_option == '' )
  35                         add_action( 'comment_form',  array( 'Akismet',  'add_comment_nonce' ), 1 );
  36
  37                 add_action( 'admin_head-edit-comments.php', array( 'Akismet', 'load_form_js' ) );
  38                 add_action( 'comment_form', array( 'Akismet', 'load_form_js' ) );
  39                 add_action( 'comment_form', array( 'Akismet', 'inject_ak_js' ) );
  40
  41                 add_filter( 'comment_moderation_recipients', array( 'Akismet', 'disable_moderation_emails_if_unreachable' ), 1000, 2 );
  42                 add_filter( 'pre_comment_approved', array( 'Akismet', 'last_comment_status' ), 10, 2 );
  43
  44                 add_action( 'transition_comment_status', array( 'Akismet', 'transition_comment_status' ), 10, 3 );
  45
  46                 // Run this early in the pingback call, before doing a remote fetch of the source uri
  47                 add_action( 'xmlrpc_call', array( 'Akismet', 'pre_check_pingback' ) );
  48
  49                 if ( '3.0.5' == $GLOBALS['wp_version'] ) {
  50                         remove_filter( 'comment_text', 'wp_kses_data' );
  51                         if ( is_admin() )
  52                                 add_filter( 'comment_text', 'wp_kses_post' );
  53                 }
  54         }
  55
  56         public static function get_api_key() {
  57                 return apply_filters( 'akismet_get_api_key', defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key') );
  58         }
  59
  60         public static function check_key_status( $key, $ip = null ) {
  61                 return self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option('home') ) ), 'verify-key', $ip );
  62         }
  63
  64         public static function verify_key( $key, $ip = null ) {
  65                 $response = self::check_key_status( $key, $ip );
  66
  67                 if ( $response[1] != 'valid' && $response[1] != 'invalid' )
  68                         return 'failed';
  69
  70                 return $response[1];
  71         }
  72
  73         public static function deactivate_key( $key ) {
  74                 $response = self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option('home') ) ), 'deactivate' );
  75
  76                 if ( $response[1] != 'deactivated' )
  77                         return 'failed';
  78
  79                 return $response[1];
  80         }
  81
  82         public static function auto_check_comment( $commentdata ) {
  83                 self::$last_comment_result = null;
  84
  85                 $comment = $commentdata;
  86
  87                 $comment['user_ip']      = self::get_ip_address();
  88                 $comment['user_agent']   = self::get_user_agent();
  89                 $comment['referrer']     = self::get_referer();
  90                 $comment['blog']         = get_option('home');
  91                 $comment['blog_lang']    = get_locale();
  92                 $comment['blog_charset'] = get_option('blog_charset');
  93                 $comment['permalink']    = get_permalink( $comment['comment_post_ID'] );
  94
  95                 if ( !empty( $comment['user_ID'] ) )
  96                         $comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );
  97
  98                 $akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
  99                 $comment['akismet_comment_nonce'] = 'inactive';
 100                 if ( $akismet_nonce_option == 'true' || $akismet_nonce_option == '' ) {
 101                         $comment['akismet_comment_nonce'] = 'failed';
 102                         if ( isset( $_POST['akismet_comment_nonce'] ) && wp_verify_nonce( $_POST['akismet_comment_nonce'], 'akismet_comment_nonce_' . $comment['comment_post_ID'] ) )
 103                                 $comment['akismet_comment_nonce'] = 'passed';
 104
 105                         // comment reply in wp-admin
 106                         if ( isset( $_POST['_ajax_nonce-replyto-comment'] ) && check_ajax_referer( 'replyto-comment', '_ajax_nonce-replyto-comment' ) )
 107                                 $comment['akismet_comment_nonce'] = 'passed';
 108
 109                 }
 110
 111                 if ( self::is_test_mode() )
 112                         $comment['is_test'] = 'true';
 113
 114                 foreach( $_POST as $key => $value ) {
 115                         if ( is_string( $value ) )
 116                                 $comment["POST_{$key}"] = $value;
 117                 }
 118
 119                 $ignore = array( 'HTTP_COOKIE', 'HTTP_COOKIE2', 'PHP_AUTH_PW' );
 120
 121                 foreach ( $_SERVER as $key => $value ) {
 122                         if ( !in_array( $key, $ignore ) && is_string($value) )
 123                                 $comment["$key"] = $value;
 124                         else
 125                                 $comment["$key"] = '';
 126                 }
 127
 128                 $post = get_post( $comment['comment_post_ID'] );
 129                 $comment[ 'comment_post_modified_gmt' ] = $post->post_modified_gmt;
 130
 131                 $response = self::http_post( Akismet::build_query( $comment ), 'comment-check' );
 132
 133                 do_action( 'akismet_comment_check_response', $response );
 134
 135                 $commentdata['comment_as_submitted'] = array_intersect_key( $comment, self::$comment_as_submitted_allowed_keys );
 136                 $commentdata['akismet_result']       = $response[1];
 137
 138                 if ( isset( $response[0]['x-akismet-pro-tip'] ) )
 139                 $commentdata['akismet_pro_tip'] = $response[0]['x-akismet-pro-tip'];
 140
 141                 if ( isset( $response[0]['x-akismet-error'] ) ) {
 142                         // An error occurred that we anticipated (like a suspended key) and want the user to act on.
 143                         // Send to moderation.
 144                         self::$last_comment_result = '0';
 145                 }
 146                 else if ( 'true' == $response[1] ) {
 147                         // akismet_spam_count will be incremented later by comment_is_spam()
 148                         self::$last_comment_result = 'spam';
 149
 150                         $discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() );
 151
 152                         do_action( 'akismet_spam_caught', $discard );
 153
 154                         if ( $discard ) {
 155                                 // akismet_result_spam() won't be called so bump the counter here
 156                                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 157                                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 158                                 $redirect_to = isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : get_permalink( $post );
 159                                 wp_safe_redirect( esc_url_raw( $redirect_to ) );
 160                                 die();
 161                         }
 162                 }
 163
 164                 // if the response is neither true nor false, hold the comment for moderation and schedule a recheck
 165                 if ( 'true' != $response[1] && 'false' != $response[1] ) {
 166                         if ( !current_user_can('moderate_comments') ) {
 167                                 // Comment status should be moderated
 168                                 self::$last_comment_result = '0';
 169                         }
 170                         if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_single_event') ) {
 171                                 if ( !wp_next_scheduled( 'akismet_schedule_cron_recheck' ) ) {
 172                                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 173                                         do_action( 'akismet_scheduled_recheck', 'invalid-response-' . $response[1] );
 174                                 }
 175                         }
 176
 177                         self::$prevent_moderation_email_for_these_comments[] = $commentdata;
 178                 }
 179
 180                 if ( function_exists('wp_next_scheduled') && function_exists('wp_schedule_event') ) {
 181                         // WP 2.1+: delete old comments daily
 182                         if ( !wp_next_scheduled( 'akismet_scheduled_delete' ) )
 183                                 wp_schedule_event( time(), 'daily', 'akismet_scheduled_delete' );
 184                 }
 185                 elseif ( (mt_rand(1, 10) == 3) ) {
 186                         // WP 2.0: run this one time in ten
 187                         self::delete_old_comments();
 188                 }
 189
 190                 self::set_last_comment( $commentdata );
 191                 self::fix_scheduled_recheck();
 192
 193                 return $commentdata;
 194         }
 195
 196         public static function get_last_comment() {
 197                 return self::$last_comment;
 198         }
 199
 200         public static function set_last_comment( $comment ) {
 201                 if ( is_null( $comment ) ) {
 202                         self::$last_comment = null;
 203                 }
 204                 else {
 205                         // We filter it here so that it matches the filtered comment data that we'll have to compare against later.
 206                         // wp_filter_comment expects comment_author_IP
 207                         self::$last_comment = wp_filter_comment(
 208                                 array_merge(
 209                                         array( 'comment_author_IP' => self::get_ip_address() ),
 210                                         $comment
 211                                 )
 212                         );
 213                 }
 214         }
 215
 216         // this fires on wp_insert_comment.  we can't update comment_meta when auto_check_comment() runs
 217         // because we don't know the comment ID at that point.
 218         public static function auto_check_update_meta( $id, $comment ) {
 219
 220                 // failsafe for old WP versions
 221                 if ( !function_exists('add_comment_meta') )
 222                         return false;
 223
 224                 if ( !isset( self::$last_comment['comment_author_email'] ) )
 225                         self::$last_comment['comment_author_email'] = '';
 226
 227                 // wp_insert_comment() might be called in other contexts, so make sure this is the same comment
 228                 // as was checked by auto_check_comment
 229                 if ( is_object( $comment ) && !empty( self::$last_comment ) && is_array( self::$last_comment ) ) {
 230                         if ( self::matches_last_comment( $comment ) ) {
 231
 232                                         load_plugin_textdomain( 'akismet' );
 233
 234                                         // normal result: true or false
 235                                         if ( self::$last_comment['akismet_result'] == 'true' ) {
 236                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'true' );
 237                                                 self::update_comment_history( $comment->comment_ID, '', 'check-spam' );
 238                                                 if ( $comment->comment_approved != 'spam' )
 239                                                         self::update_comment_history(
 240                                                                 $comment->comment_ID,
 241                                                                 '',
 242                                                                 'status-changed-'.$comment->comment_approved
 243                                                         );
 244                                         }
 245                                         elseif ( self::$last_comment['akismet_result'] == 'false' ) {
 246                                                 update_comment_meta( $comment->comment_ID, 'akismet_result', 'false' );
 247                                                 self::update_comment_history( $comment->comment_ID, '', 'check-ham' );
 248                                                 if ( $comment->comment_approved == 'spam' ) {
 249                                                         if ( wp_blacklist_check($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent) )
 250                                                                 self::update_comment_history( $comment->comment_ID, '', 'wp-blacklisted' );
 251                                                         else
 252                                                                 self::update_comment_history( $comment->comment_ID, '', 'status-changed-'.$comment->comment_approved );
 253                                                 }
 254                                         } // abnormal result: error
 255                                         else {
 256                                                 update_comment_meta( $comment->comment_ID, 'akismet_error', time() );
 257                                                 self::update_comment_history(
 258                                                         $comment->comment_ID,
 259                                                         '',
 260                                                         'check-error',
 261                                                         array( 'response' => substr( self::$last_comment['akismet_result'], 0, 50 ) )
 262                                                 );
 263                                         }
 264
 265                                         // record the complete original data as submitted for checking
 266                                         if ( isset( self::$last_comment['comment_as_submitted'] ) )
 267                                                 update_comment_meta( $comment->comment_ID, 'akismet_as_submitted', self::$last_comment['comment_as_submitted'] );
 268
 269                                         if ( isset( self::$last_comment['akismet_pro_tip'] ) )
 270                                                 update_comment_meta( $comment->comment_ID, 'akismet_pro_tip', self::$last_comment['akismet_pro_tip'] );
 271                         }
 272                 }
 273         }
 274
 275         public static function delete_old_comments() {
 276                 global $wpdb;
 277
 278                 /**
 279                  * Determines how many comments will be deleted in each batch.
 280                  *
 281                  * @param int The default, as defined by AKISMET_DELETE_LIMIT.
 282                  */
 283                 $delete_limit = apply_filters( 'akismet_delete_comment_limit', defined( 'AKISMET_DELETE_LIMIT' ) ? AKISMET_DELETE_LIMIT : 10000 );
 284                 $delete_limit = max( 1, intval( $delete_limit ) );
 285
 286                 /**
 287                  * Determines how many days a comment will be left in the Spam queue before being deleted.
 288                  *
 289                  * @param int The default number of days.
 290                  */
 291                 $delete_interval = apply_filters( 'akismet_delete_comment_interval', 15 );
 292                 $delete_interval = max( 1, intval( $delete_interval ) );
 293
 294                 while ( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_id FROM {$wpdb->comments} WHERE DATE_SUB(NOW(), INTERVAL %d DAY) > comment_date_gmt AND comment_approved = 'spam' LIMIT %d", $delete_interval, $delete_limit ) ) ) {
 295                         if ( empty( $comment_ids ) )
 296                                 return;
 297
 298                         $wpdb->queries = array();
 299
 300                         foreach ( $comment_ids as $comment_id ) {
 301                                 do_action( 'delete_comment', $comment_id );
 302                         }
 303
 304                         $comma_comment_ids = implode( ', ', array_map('intval', $comment_ids) );
 305
 306                         $wpdb->query("DELETE FROM {$wpdb->comments} WHERE comment_id IN ( $comma_comment_ids )");
 307                         $wpdb->query("DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( $comma_comment_ids )");
 308
 309                         clean_comment_cache( $comment_ids );
 310                 }
 311
 312                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number
 313                         $wpdb->query("OPTIMIZE TABLE {$wpdb->comments}");
 314         }
 315
 316         public static function delete_old_comments_meta() {
 317                 global $wpdb;
 318
 319                 $interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 );
 320
 321                 # enfore a minimum of 1 day
 322                 $interval = absint( $interval );
 323                 if ( $interval < 1 )
 324                         $interval = 1;
 325
 326                 // akismet_as_submitted meta values are large, so expire them
 327                 // after $interval days regardless of the comment status
 328                 while ( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT m.comment_id FROM {$wpdb->commentmeta} as m INNER JOIN {$wpdb->comments} as c USING(comment_id) WHERE m.meta_key = 'akismet_as_submitted' AND DATE_SUB(NOW(), INTERVAL %d DAY) > c.comment_date_gmt LIMIT 10000", $interval ) ) ) {
 329                         if ( empty( $comment_ids ) )
 330                                 return;
 331
 332                         $wpdb->queries = array();
 333
 334                         foreach ( $comment_ids as $comment_id ) {
 335                                 delete_comment_meta( $comment_id, 'akismet_as_submitted' );
 336                         }
 337                 }
 338
 339                 if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->commentmeta ) ) // lucky number
 340                         $wpdb->query("OPTIMIZE TABLE {$wpdb->commentmeta}");
 341         }
 342
 343         // how many approved comments does this author have?
 344         public static function get_user_comments_approved( $user_id, $comment_author_email, $comment_author, $comment_author_url ) {
 345                 global $wpdb;
 346
 347                 if ( !empty( $user_id ) )
 348                         return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE user_id = %d AND comment_approved = 1", $user_id ) );
 349
 350                 if ( !empty( $comment_author_email ) )
 351                         return (int) $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM {$wpdb->comments} WHERE comment_author_email = %s AND comment_author = %s AND comment_author_url = %s AND comment_approved = 1", $comment_author_email, $comment_author, $comment_author_url ) );
 352
 353                 return 0;
 354         }
 355
 356         // get the full comment history for a given comment, as an array in reverse chronological order
 357         public static function get_comment_history( $comment_id ) {
 358
 359                 // failsafe for old WP versions
 360                 if ( !function_exists('add_comment_meta') )
 361                         return false;
 362
 363                 $history = get_comment_meta( $comment_id, 'akismet_history', false );
 364                 usort( $history, array( 'Akismet', '_cmp_time' ) );
 365                 return $history;
 366         }
 367
 368         /**
 369          * Log an event for a given comment, storing it in comment_meta.
 370          *
 371          * @param int $comment_id The ID of the relevant comment.
 372          * @param string $message The string description of the event. No longer used.
 373          * @param string $event The event code.
 374          * @param array $meta Metadata about the history entry. e.g., the user that reported or changed the status of a given comment.
 375          */
 376         public static function update_comment_history( $comment_id, $message, $event=null, $meta=null ) {
 377                 global $current_user;
 378
 379                 // failsafe for old WP versions
 380                 if ( !function_exists('add_comment_meta') )
 381                         return false;
 382
 383                 $user = '';
 384
 385                 $event = array(
 386                         'time'    => self::_get_microtime(),
 387                         'event'   => $event,
 388                 );
 389
 390                 if ( is_object( $current_user ) && isset( $current_user->user_login ) ) {
 391                         $event['user'] = $current_user->user_login;
 392                 }
 393
 394                 if ( ! empty( $meta ) ) {
 395                         $event['meta'] = $meta;
 396                 }
 397
 398                 // $unique = false so as to allow multiple values per comment
 399                 $r = add_comment_meta( $comment_id, 'akismet_history', $event, false );
 400         }
 401
 402         public static function check_db_comment( $id, $recheck_reason = 'recheck_queue' ) {
 403                 global $wpdb;
 404
 405                 $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $id ), ARRAY_A );
 406                 if ( !$c )
 407                         return;
 408
 409                 $c['user_ip']        = $c['comment_author_IP'];
 410                 $c['user_agent']     = $c['comment_agent'];
 411                 $c['referrer']       = '';
 412                 $c['blog']           = get_option('home');
 413                 $c['blog_lang']      = get_locale();
 414                 $c['blog_charset']   = get_option('blog_charset');
 415                 $c['permalink']      = get_permalink($c['comment_post_ID']);
 416                 $c['recheck_reason'] = $recheck_reason;
 417
 418                 if ( self::is_test_mode() )
 419                         $c['is_test'] = 'true';
 420
 421                 $response = self::http_post( Akismet::build_query( $c ), 'comment-check' );
 422
 423                 return ( is_array( $response ) && ! empty( $response[1] ) ) ? $response[1] : false;
 424         }
 425
 426
 427
 428         public static function transition_comment_status( $new_status, $old_status, $comment ) {
 429
 430                 if ( $new_status == $old_status )
 431                         return;
 432
 433                 # we don't need to record a history item for deleted comments
 434                 if ( $new_status == 'delete' )
 435                         return;
 436
 437                 if ( !current_user_can( 'edit_post', $comment->comment_post_ID ) && !current_user_can( 'moderate_comments' ) )
 438                         return;
 439
 440                 if ( defined('WP_IMPORTING') && WP_IMPORTING == true )
 441                         return;
 442
 443                 // if this is present, it means the status has been changed by a re-check, not an explicit user action
 444                 if ( get_comment_meta( $comment->comment_ID, 'akismet_rechecking' ) )
 445                         return;
 446
 447                 global $current_user;
 448                 $reporter = '';
 449                 if ( is_object( $current_user ) )
 450                         $reporter = $current_user->user_login;
 451
 452                 // Assumption alert:
 453                 // We want to submit comments to Akismet only when a moderator explicitly spams or approves it - not if the status
 454                 // is changed automatically by another plugin.  Unfortunately WordPress doesn't provide an unambiguous way to
 455                 // determine why the transition_comment_status action was triggered.  And there are several different ways by which
 456                 // to spam and unspam comments: bulk actions, ajax, links in moderation emails, the dashboard, and perhaps others.
 457                 // We'll assume that this is an explicit user action if certain POST/GET variables exist.
 458                 if ( ( isset( $_POST['status'] ) && in_array( $_POST['status'], array( 'spam', 'unspam' ) ) ) ||
 459                          ( isset( $_POST['spam'] )   && (int) $_POST['spam'] == 1 ) ||
 460                          ( isset( $_POST['unspam'] ) && (int) $_POST['unspam'] == 1 ) ||
 461                          ( isset( $_POST['comment_status'] )  && in_array( $_POST['comment_status'], array( 'spam', 'unspam' ) ) ) ||
 462                          ( isset( $_GET['action'] )  && in_array( $_GET['action'], array( 'spam', 'unspam' ) ) ) ||
 463                          ( isset( $_POST['action'] ) && in_array( $_POST['action'], array( 'editedcomment' ) ) )
 464                  ) {
 465                         if ( $new_status == 'spam' && ( $old_status == 'approved' || $old_status == 'unapproved' || !$old_status ) ) {
 466                                 return self::submit_spam_comment( $comment->comment_ID );
 467                         } elseif ( $old_status == 'spam' && ( $new_status == 'approved' || $new_status == 'unapproved' ) ) {
 468                                 return self::submit_nonspam_comment( $comment->comment_ID );
 469                         }
 470                 }
 471
 472                 self::update_comment_history( $comment->comment_ID, '', 'status-' . $new_status );
 473         }
 474
 475         public static function submit_spam_comment( $comment_id ) {
 476                 global $wpdb, $current_user, $current_site;
 477
 478                 $comment_id = (int) $comment_id;
 479
 480                 $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
 481
 482                 if ( !$comment ) // it was deleted
 483                         return;
 484
 485                 if ( 'spam' != $comment->comment_approved )
 486                         return;
 487
 488                 // use the original version stored in comment_meta if available
 489                 $as_submitted = self::sanitize_comment_as_submitted( get_comment_meta( $comment_id, 'akismet_as_submitted', true ) );
 490
 491                 if ( $as_submitted && is_array( $as_submitted ) && isset( $as_submitted['comment_content'] ) )
 492                         $comment = (object) array_merge( (array)$comment, $as_submitted );
 493
 494                 $comment->blog         = get_bloginfo('url');
 495                 $comment->blog_lang    = get_locale();
 496                 $comment->blog_charset = get_option('blog_charset');
 497                 $comment->permalink    = get_permalink($comment->comment_post_ID);
 498
 499                 if ( is_object($current_user) )
 500                         $comment->reporter = $current_user->user_login;
 501
 502                 if ( is_object($current_site) )
 503                         $comment->site_domain = $current_site->domain;
 504
 505                 $comment->user_role = '';
 506                 if ( isset( $comment->user_ID ) )
 507                         $comment->user_role = Akismet::get_user_roles( $comment->user_ID );
 508
 509                 if ( self::is_test_mode() )
 510                         $comment->is_test = 'true';
 511
 512                 $post = get_post( $comment->comment_post_ID );
 513                 $comment->comment_post_modified_gmt = $post->post_modified_gmt;
 514
 515                 $response = Akismet::http_post( Akismet::build_query( $comment ), 'submit-spam' );
 516                 if ( $comment->reporter ) {
 517                         self::update_comment_history( $comment_id, '', 'report-spam' );
 518                         update_comment_meta( $comment_id, 'akismet_user_result', 'true' );
 519                         update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
 520                 }
 521
 522                 do_action('akismet_submit_spam_comment', $comment_id, $response[1]);
 523         }
 524
 525         public static function submit_nonspam_comment( $comment_id ) {
 526                 global $wpdb, $current_user, $current_site;
 527
 528                 $comment_id = (int) $comment_id;
 529
 530                 $comment = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->comments} WHERE comment_ID = %d", $comment_id ) );
 531                 if ( !$comment ) // it was deleted
 532                         return;
 533
 534                 // use the original version stored in comment_meta if available
 535                 $as_submitted = self::sanitize_comment_as_submitted( get_comment_meta( $comment_id, 'akismet_as_submitted', true ) );
 536
 537                 if ( $as_submitted && is_array($as_submitted) && isset($as_submitted['comment_content']) )
 538                         $comment = (object) array_merge( (array)$comment, $as_submitted );
 539
 540                 $comment->blog         = get_bloginfo('url');
 541                 $comment->blog_lang    = get_locale();
 542                 $comment->blog_charset = get_option('blog_charset');
 543                 $comment->permalink    = get_permalink( $comment->comment_post_ID );
 544                 $comment->user_role    = '';
 545
 546                 if ( is_object($current_user) )
 547                         $comment->reporter = $current_user->user_login;
 548
 549                 if ( is_object($current_site) )
 550                         $comment->site_domain = $current_site->domain;
 551
 552                 if ( isset( $comment->user_ID ) )
 553                         $comment->user_role = Akismet::get_user_roles($comment->user_ID);
 554
 555                 if ( Akismet::is_test_mode() )
 556                         $comment->is_test = 'true';
 557
 558                 $post = get_post( $comment->comment_post_ID );
 559                 $comment->comment_post_modified_gmt = $post->post_modified_gmt;
 560
 561                 $response = self::http_post( Akismet::build_query( $comment ), 'submit-ham' );
 562                 if ( $comment->reporter ) {
 563                         self::update_comment_history( $comment_id, '', 'report-ham' );
 564                         update_comment_meta( $comment_id, 'akismet_user_result', 'false' );
 565                         update_comment_meta( $comment_id, 'akismet_user', $comment->reporter );
 566                 }
 567
 568                 do_action('akismet_submit_nonspam_comment', $comment_id, $response[1]);
 569         }
 570
 571         public static function cron_recheck() {
 572                 global $wpdb;
 573
 574                 $api_key = self::get_api_key();
 575
 576                 $status = self::verify_key( $api_key );
 577                 if ( get_option( 'akismet_alert_code' ) || $status == 'invalid' ) {
 578                         // since there is currently a problem with the key, reschedule a check for 6 hours hence
 579                         wp_schedule_single_event( time() + 21600, 'akismet_schedule_cron_recheck' );
 580                         do_action( 'akismet_scheduled_recheck', 'key-problem-' . get_option( 'akismet_alert_code' ) . '-' . $status );
 581                         return false;
 582                 }
 583
 584                 delete_option('akismet_available_servers');
 585
 586                 $comment_errors = $wpdb->get_col( "SELECT comment_id FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error' LIMIT 100" );
 587
 588                 load_plugin_textdomain( 'akismet' );
 589
 590                 foreach ( (array) $comment_errors as $comment_id ) {
 591                         // if the comment no longer exists, or is too old, remove the meta entry from the queue to avoid getting stuck
 592                         $comment = get_comment( $comment_id );
 593                         if ( !$comment || strtotime( $comment->comment_date_gmt ) < strtotime( "-15 days" ) ) {
 594                                 delete_comment_meta( $comment_id, 'akismet_error' );
 595                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 596                                 continue;
 597                         }
 598
 599                         add_comment_meta( $comment_id, 'akismet_rechecking', true );
 600                         $status = self::check_db_comment( $comment_id, 'retry' );
 601
 602                         $event = '';
 603                         if ( $status == 'true' ) {
 604                                 $event = 'cron-retry-spam';
 605                         } elseif ( $status == 'false' ) {
 606                                 $event = 'cron-retry-ham';
 607                         }
 608
 609                         // If we got back a legit response then update the comment history
 610                         // other wise just bail now and try again later.  No point in
 611                         // re-trying all the comments once we hit one failure.
 612                         if ( !empty( $event ) ) {
 613                                 delete_comment_meta( $comment_id, 'akismet_error' );
 614                                 self::update_comment_history( $comment_id, '', $event );
 615                                 update_comment_meta( $comment_id, 'akismet_result', $status );
 616                                 // make sure the comment status is still pending.  if it isn't, that means the user has already moved it elsewhere.
 617                                 $comment = get_comment( $comment_id );
 618                                 if ( $comment && 'unapproved' == wp_get_comment_status( $comment_id ) ) {
 619                                         if ( $status == 'true' ) {
 620                                                 wp_spam_comment( $comment_id );
 621                                         } elseif ( $status == 'false' ) {
 622                                                 // comment is good, but it's still in the pending queue.  depending on the moderation settings
 623                                                 // we may need to change it to approved.
 624                                                 if ( check_comment($comment->comment_author, $comment->comment_author_email, $comment->comment_author_url, $comment->comment_content, $comment->comment_author_IP, $comment->comment_agent, $comment->comment_type) )
 625                                                         wp_set_comment_status( $comment_id, 1 );
 626                                                 else if ( get_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true ) )
 627                                                         wp_notify_moderator( $comment_id );
 628                                         }
 629                                 }
 630
 631                                 delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 632                         } else {
 633                                 // If this comment has been pending moderation for longer than MAX_DELAY_BEFORE_MODERATION_EMAIL,
 634                                 // send a moderation email now.
 635                                 if ( ( intval( gmdate( 'U' ) ) - strtotime( $comment->comment_date_gmt ) ) < self::MAX_DELAY_BEFORE_MODERATION_EMAIL ) {
 636                                         delete_comment_meta( $comment_id, 'akismet_delayed_moderation_email' );
 637                                         wp_notify_moderator( $comment_id );
 638                                 }
 639
 640                                 delete_comment_meta( $comment_id, 'akismet_rechecking' );
 641                                 wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 642                                 do_action( 'akismet_scheduled_recheck', 'check-db-comment-' . $status );
 643                                 return;
 644                         }
 645                         delete_comment_meta( $comment_id, 'akismet_rechecking' );
 646                 }
 647
 648                 $remaining = $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->commentmeta} WHERE meta_key = 'akismet_error'" );
 649                 if ( $remaining && !wp_next_scheduled('akismet_schedule_cron_recheck') ) {
 650                         wp_schedule_single_event( time() + 1200, 'akismet_schedule_cron_recheck' );
 651                         do_action( 'akismet_scheduled_recheck', 'remaining' );
 652                 }
 653         }
 654
 655         public static function fix_scheduled_recheck() {
 656                 $future_check = wp_next_scheduled( 'akismet_schedule_cron_recheck' );
 657                 if ( !$future_check ) {
 658                         return;
 659                 }
 660
 661                 if ( get_option( 'akismet_alert_code' ) > 0 ) {
 662                         return;
 663                 }
 664
 665                 $check_range = time() + 1200;
 666                 if ( $future_check > $check_range ) {
 667                         wp_clear_scheduled_hook( 'akismet_schedule_cron_recheck' );
 668                         wp_schedule_single_event( time() + 300, 'akismet_schedule_cron_recheck' );
 669                         do_action( 'akismet_scheduled_recheck', 'fix-scheduled-recheck' );
 670                 }
 671         }
 672
 673         public static function add_comment_nonce( $post_id ) {
 674                 echo '<p style="display: none;">';
 675                 wp_nonce_field( 'akismet_comment_nonce_' . $post_id, 'akismet_comment_nonce', FALSE );
 676                 echo '</p>';
 677         }
 678
 679         public static function is_test_mode() {
 680                 return defined('AKISMET_TEST_MODE') && AKISMET_TEST_MODE;
 681         }
 682
 683         public static function allow_discard() {
 684                 if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
 685                         return false;
 686                 if ( is_user_logged_in() )
 687                         return false;
 688
 689                 return ( get_option( 'akismet_strictness' ) === '1'  );
 690         }
 691
 692         public static function get_ip_address() {
 693                 return isset( $_SERVER['REMOTE_ADDR'] ) ? $_SERVER['REMOTE_ADDR'] : null;
 694         }
 695
 696         /**
 697          * Do these two comments, without checking the comment_ID, "match"?
 698          *
 699          * @param mixed $comment1 A comment object or array.
 700          * @param mixed $comment2 A comment object or array.
 701          * @return bool Whether the two comments should be treated as the same comment.
 702          */
 703         private static function comments_match( $comment1, $comment2 ) {
 704                 $comment1 = (array) $comment1;
 705                 $comment2 = (array) $comment2;
 706
 707                 return (
 708                            isset( $comment1['comment_post_ID'], $comment2['comment_post_ID'] )
 709                         && intval( $comment1['comment_post_ID'] ) == intval( $comment2['comment_post_ID'] )
 710                         && (
 711                                 // The comment author length max is 255 characters, limited by the TINYTEXT column type.
 712                                 substr( $comment1['comment_author'], 0, 255 ) == substr( $comment2['comment_author'], 0, 255 )
 713                                 || substr( stripslashes( $comment1['comment_author'] ), 0, 255 ) == substr( $comment2['comment_author'], 0, 255 )
 714                                 || substr( $comment1['comment_author'], 0, 255 ) == substr( stripslashes( $comment2['comment_author'] ), 0, 255 )
 715                                 )
 716                         && (
 717                                 // The email max length is 100 characters, limited by the VARCHAR(100) column type.
 718                                 substr( $comment1['comment_author_email'], 0, 100 ) == substr( $comment2['comment_author_email'], 0, 100 )
 719                                 || substr( stripslashes( $comment1['comment_author_email'] ), 0, 100 ) == substr( $comment2['comment_author_email'], 0, 100 )
 720                                 || substr( $comment1['comment_author_email'], 0, 100 ) == substr( stripslashes( $comment2['comment_author_email'] ), 0, 100 )
 721                                 // Very long emails can be truncated and then stripped if the [0:100] substring isn't a valid address.
 722                                 || ( ! $comment1['comment_author_email'] && strlen( $comment2['comment_author_email'] ) > 100 )
 723                                 || ( ! $comment2['comment_author_email'] && strlen( $comment1['comment_author_email'] ) > 100 )
 724                         )
 725                 );
 726         }
 727
 728         // Does the supplied comment match the details of the one most recently stored in self::$last_comment?
 729         public static function matches_last_comment( $comment ) {
 730                 if ( is_object( $comment ) )
 731                         $comment = (array) $comment;
 732
 733                 return self::comments_match( self::$last_comment, $comment );
 734         }
 735
 736         private static function get_user_agent() {
 737                 return isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : null;
 738         }
 739
 740         private static function get_referer() {
 741                 return isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : null;
 742         }
 743
 744         // return a comma-separated list of role names for the given user
 745         public static function get_user_roles( $user_id ) {
 746                 $roles = false;
 747
 748                 if ( !class_exists('WP_User') )
 749                         return false;
 750
 751                 if ( $user_id > 0 ) {
 752                         $comment_user = new WP_User( $user_id );
 753                         if ( isset( $comment_user->roles ) )
 754                                 $roles = join( ',', $comment_user->roles );
 755                 }
 756
 757                 if ( is_multisite() && is_super_admin( $user_id ) ) {
 758                         if ( empty( $roles ) ) {
 759                                 $roles = 'super_admin';
 760                         } else {
 761                                 $comment_user->roles[] = 'super_admin';
 762                                 $roles = join( ',', $comment_user->roles );
 763                         }
 764                 }
 765
 766                 return $roles;
 767         }
 768
 769         // filter handler used to return a spam result to pre_comment_approved
 770         public static function last_comment_status( $approved, $comment ) {
 771                 // Only do this if it's the correct comment
 772                 if ( is_null(self::$last_comment_result) || ! self::matches_last_comment( $comment ) ) {
 773                         self::log( "comment_is_spam mismatched comment, returning unaltered $approved" );
 774                         return $approved;
 775                 }
 776
 777                 // bump the counter here instead of when the filter is added to reduce the possibility of overcounting
 778                 if ( $incr = apply_filters('akismet_spam_count_incr', 1) )
 779                         update_option( 'akismet_spam_count', get_option('akismet_spam_count') + $incr );
 780
 781                 return self::$last_comment_result;
 782         }
 783
 784         /**
 785          * If Akismet is temporarily unreachable, we don't want to "spam" the blogger with
 786          * moderation emails for comments that will be automatically cleared or spammed on
 787          * the next retry.
 788          *
 789          * For comments that will be rechecked later, empty the list of email addresses that
 790          * the moderation email would be sent to.
 791          *
 792          * @param array $emails An array of email addresses that the moderation email will be sent to.
 793          * @param int $comment_id The ID of the relevant comment.
 794          * @return array An array of email addresses that the moderation email will be sent to.
 795          */
 796         public static function disable_moderation_emails_if_unreachable( $emails, $comment_id ) {
 797                 if ( ! empty( self::$prevent_moderation_email_for_these_comments ) && ! empty( $emails ) ) {
 798                         $comment = get_comment( $comment_id );
 799
 800                         foreach ( self::$prevent_moderation_email_for_these_comments as $possible_match ) {
 801                                 if ( self::comments_match( $possible_match, $comment ) ) {
 802                                         update_comment_meta( $comment_id, 'akismet_delayed_moderation_email', true );
 803                                         return array();
 804                                 }
 805                         }
 806                 }
 807
 808                 return $emails;
 809         }
 810
 811         public static function _cmp_time( $a, $b ) {
 812                 return $a['time'] > $b['time'] ? -1 : 1;
 813         }
 814
 815         public static function _get_microtime() {
 816                 $mtime = explode( ' ', microtime() );
 817                 return $mtime[1] + $mtime[0];
 818         }
 819
 820         /**
 821          * Make a POST request to the Akismet API.
 822          *
 823          * @param string $request The body of the request.
 824          * @param string $path The path for the request.
 825          * @param string $ip The specific IP address to hit.
 826          * @return array A two-member array consisting of the headers and the response body, both empty in the case of a failure.
 827          */
 828         public static function http_post( $request, $path, $ip=null ) {
 829
 830                 $akismet_ua = sprintf( 'WordPress/%s | Akismet/%s', $GLOBALS['wp_version'], constant( 'AKISMET_VERSION' ) );
 831                 $akismet_ua = apply_filters( 'akismet_ua', $akismet_ua );
 832
 833                 $content_length = strlen( $request );
 834
 835                 $api_key   = self::get_api_key();
 836                 $host      = self::API_HOST;
 837
 838                 if ( !empty( $api_key ) )
 839                         $host = $api_key.'.'.$host;
 840
 841                 $http_host = $host;
 842                 // use a specific IP if provided
 843                 // needed by Akismet_Admin::check_server_connectivity()
 844                 if ( $ip && long2ip( ip2long( $ip ) ) ) {
 845                         $http_host = $ip;
 846                 }
 847
 848                 $http_args = array(
 849                         'body' => $request,
 850                         'headers' => array(
 851                                 'Content-Type' => 'application/x-www-form-urlencoded; charset=' . get_option( 'blog_charset' ),
 852                                 'Host' => $host,
 853                                 'User-Agent' => $akismet_ua,
 854                         ),
 855                         'httpversion' => '1.0',
 856                         'timeout' => 15
 857                 );
 858
 859                 $akismet_url = $http_akismet_url = "http://{$http_host}/1.1/{$path}";
 860
 861                 /**
 862                  * Try SSL first; if that fails, try without it and don't try it again for a while.
 863                  */
 864
 865                 $ssl = $ssl_failed = false;
 866
 867                 // Check if SSL requests were disabled fewer than X hours ago.
 868                 $ssl_disabled = get_option( 'akismet_ssl_disabled' );
 869
 870                 if ( $ssl_disabled && $ssl_disabled < ( time() - 60 * 60 * 24 ) ) { // 24 hours
 871                         $ssl_disabled = false;
 872                         delete_option( 'akismet_ssl_disabled' );
 873                 }
 874                 else if ( $ssl_disabled ) {
 875                         do_action( 'akismet_ssl_disabled' );
 876                 }
 877
 878                 if ( ! $ssl_disabled && function_exists( 'wp_http_supports') && ( $ssl = wp_http_supports( array( 'ssl' ) ) ) ) {
 879                         $akismet_url = set_url_scheme( $akismet_url, 'https' );
 880
 881                         do_action( 'akismet_https_request_pre' );
 882                 }
 883
 884                 $response = wp_remote_post( $akismet_url, $http_args );
 885
 886                 Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
 887
 888                 if ( $ssl && is_wp_error( $response ) ) {
 889                         do_action( 'akismet_https_request_failure', $response );
 890
 891                         // Intermittent connection problems may cause the first HTTPS
 892                         // request to fail and subsequent HTTP requests to succeed randomly.
 893                         // Retry the HTTPS request once before disabling SSL for a time.
 894                         $response = wp_remote_post( $akismet_url, $http_args );
 895
 896                         Akismet::log( compact( 'akismet_url', 'http_args', 'response' ) );
 897
 898                         if ( is_wp_error( $response ) ) {
 899                                 $ssl_failed = true;
 900
 901                                 do_action( 'akismet_https_request_failure', $response );
 902
 903                                 do_action( 'akismet_http_request_pre' );
 904
 905                                 // Try the request again without SSL.
 906                                 $response = wp_remote_post( $http_akismet_url, $http_args );
 907
 908                                 Akismet::log( compact( 'http_akismet_url', 'http_args', 'response' ) );
 909                         }
 910                 }
 911
 912                 if ( is_wp_error( $response ) ) {
 913                         do_action( 'akismet_request_failure', $response );
 914
 915                         return array( '', '' );
 916                 }
 917
 918                 if ( $ssl_failed ) {
 919                         // The request failed when using SSL but succeeded without it. Disable SSL for future requests.
 920                         update_option( 'akismet_ssl_disabled', time() );
 921
 922                         do_action( 'akismet_https_disabled' );
 923                 }
 924
 925                 $simplified_response = array( $response['headers'], $response['body'] );
 926
 927                 self::update_alert( $simplified_response );
 928
 929                 return $simplified_response;
 930         }
 931
 932         // given a response from an API call like check_key_status(), update the alert code options if an alert is present.
 933         private static function update_alert( $response ) {
 934                 $code = $msg = null;
 935                 if ( isset( $response[0]['x-akismet-alert-code'] ) ) {
 936                         $code = $response[0]['x-akismet-alert-code'];
 937                         $msg  = $response[0]['x-akismet-alert-msg'];
 938                 }
 939
 940                 // only call update_option() if the value has changed
 941                 if ( $code != get_option( 'akismet_alert_code' ) ) {
 942                         if ( ! $code ) {
 943                                 delete_option( 'akismet_alert_code' );
 944                                 delete_option( 'akismet_alert_msg' );
 945                         }
 946                         else {
 947                                 update_option( 'akismet_alert_code', $code );
 948                                 update_option( 'akismet_alert_msg', $msg );
 949                         }
 950                 }
 951         }
 952
 953         public static function load_form_js() {
 954                 // WP < 3.3 can't enqueue a script this late in the game and still have it appear in the footer.
 955                 // Once we drop support for everything pre-3.3, this can change back to a single enqueue call.
 956                 wp_register_script( 'akismet-form', AKISMET__PLUGIN_URL . '_inc/form.js', array(), AKISMET_VERSION, true );
 957                 add_action( 'wp_footer', array( 'Akismet', 'print_form_js' ) );
 958                 add_action( 'admin_footer', array( 'Akismet', 'print_form_js' ) );
 959         }
 960
 961         public static function print_form_js() {
 962                 wp_print_scripts( 'akismet-form' );
 963         }
 964
 965         public static function inject_ak_js( $fields ) {
 966                 echo '<p style="display: none;">';
 967                 echo '<input type="hidden" id="ak_js" name="ak_js" value="' . mt_rand( 0, 250 ) . '"/>';
 968                 echo '</p>';
 969         }
 970
 971         private static function bail_on_activation( $message, $deactivate = true ) {
 972 ?>
 973 <!doctype html>
 974 <html>
 975 <head>
 976 <meta charset="<?php bloginfo( 'charset' ); ?>">
 977 <style>
 978 * {
 979         text-align: center;
 980         margin: 0;
 981         padding: 0;
 982         font-family: "Lucida Grande",Verdana,Arial,"Bitstream Vera Sans",sans-serif;
 983 }
 984 p {
 985         margin-top: 1em;
 986         font-size: 18px;
 987 }
 988 </style>
 989 <body>
 990 <p><?php echo esc_html( $message ); ?></p>
 991 </body>
 992 </html>
 993 <?php
 994                 if ( $deactivate ) {
 995                         $plugins = get_option( 'active_plugins' );
 996                         $akismet = plugin_basename( AKISMET__PLUGIN_DIR . 'akismet.php' );
 997                         $update  = false;
 998                         foreach ( $plugins as $i => $plugin ) {
 999                                 if ( $plugin === $akismet ) {
1000                                         $plugins[$i] = false;
1001                                         $update = true;
1002                                 }
1003                         }
1004
1005                         if ( $update ) {
1006                                 update_option( 'active_plugins', array_filter( $plugins ) );
1007                         }
1008                 }
1009                 exit;
1010         }
1011
1012         public static function view( $name, array $args = array() ) {
1013                 $args = apply_filters( 'akismet_view_arguments', $args, $name );
1014
1015                 foreach ( $args AS $key => $val ) {
1016                         $$key = $val;
1017                 }
1018
1019                 load_plugin_textdomain( 'akismet' );
1020
1021                 $file = AKISMET__PLUGIN_DIR . 'views/'. $name . '.php';
1022
1023                 include( $file );
1024         }
1025
1026         /**
1027          * Attached to activate_{ plugin_basename( __FILES__ ) } by register_activation_hook()
1028          * @static
1029          */
1030         public static function plugin_activation() {
1031                 if ( version_compare( $GLOBALS['wp_version'], AKISMET__MINIMUM_WP_VERSION, '<' ) ) {
1032                         load_plugin_textdomain( 'akismet' );
1033
1034                         $message = '<strong>'.sprintf(esc_html__( 'Akismet %s requires WordPress %s or higher.' , 'akismet'), AKISMET_VERSION, AKISMET__MINIMUM_WP_VERSION ).'</strong> '.sprintf(__('Please <a href="%1$s">upgrade WordPress</a> to a current version, or <a href="%2$s">downgrade to version 2.4 of the Akismet plugin</a>.', 'akismet'), 'https://codex.wordpress.org/Upgrading_WordPress', 'http://wordpress.org/extend/plugins/akismet/download/');
1035
1036                         Akismet::bail_on_activation( $message );
1037                 }
1038         }
1039
1040         /**
1041          * Removes all connection options
1042          * @static
1043          */
1044         public static function plugin_deactivation( ) {
1045                 return self::deactivate_key( self::get_api_key() );
1046         }
1047
1048         /**
1049          * Essentially a copy of WP's build_query but one that doesn't expect pre-urlencoded values.
1050          *
1051          * @param array $args An array of key => value pairs
1052          * @return string A string ready for use as a URL query string.
1053          */
1054         public static function build_query( $args ) {
1055                 return _http_build_query( $args, '', '&' );
1056         }
1057
1058         /**
1059          * Log debugging info to the error log.
1060          *
1061          * Enabled when WP_DEBUG_LOG is enabled, but can be disabled via the akismet_debug_log filter.
1062          *
1063          * @param mixed $akismet_debug The data to log.
1064          */
1065         public static function log( $akismet_debug ) {
1066                 if ( apply_filters( 'akismet_debug_log', defined( 'WP_DEBUG_LOG' ) && WP_DEBUG_LOG ) ) {
1067                         error_log( print_r( compact( 'akismet_debug' ), true ) );
1068                 }
1069         }
1070
1071         public static function pre_check_pingback( $method ) {
1072                 if ( $method !== 'pingback.ping' )
1073                         return;
1074
1075                 global $wp_xmlrpc_server;
1076
1077                 if ( !is_object( $wp_xmlrpc_server ) )
1078                         return false;
1079
1080                 // Lame: tightly coupled with the IXR class.
1081                 $args = $wp_xmlrpc_server->message->params;
1082
1083                 if ( !empty( $args[1] ) ) {
1084                         $post_id = url_to_postid( $args[1] );
1085
1086                         // If this gets through the pre-check, make sure we properly identify the outbound request as a pingback verification
1087                         Akismet::pingback_forwarded_for( null, $args[0] );
1088                         add_filter( 'http_request_args', array( 'Akismet', 'pingback_forwarded_for' ), 10, 2 );
1089
1090                         $comment = array(
1091                                 'comment_author_url' => $args[0],
1092                                 'comment_post_ID' => $post_id,
1093                                 'comment_author' => '',
1094                                 'comment_author_email' => '',
1095                                 'comment_content' => '',
1096                                 'comment_type' => 'pingback',
1097                                 'akismet_pre_check' => '1',
1098                                 'comment_pingback_target' => $args[1],
1099                         );
1100
1101                         $comment = Akismet::auto_check_comment( $comment );
1102
1103                         if ( isset( $comment['akismet_result'] ) && 'true' == $comment['akismet_result'] ) {
1104                                 // Lame: tightly coupled with the IXR classes. Unfortunately the action provides no context and no way to return anything.
1105                                 $wp_xmlrpc_server->error( new IXR_Error( 0, 'Invalid discovery target' ) );
1106                         }
1107                 }
1108         }
1109
1110         public static function pingback_forwarded_for( $r, $url ) {
1111                 static $urls = array();
1112
1113                 // Call this with $r == null to prime the callback to add headers on a specific URL
1114                 if ( is_null( $r ) && !in_array( $url, $urls ) ) {
1115                         $urls[] = $url;
1116                 }
1117
1118                 // Add X-Pingback-Forwarded-For header, but only for requests to a specific URL (the apparent pingback source)
1119                 if ( is_array( $r ) && is_array( $r['headers'] ) && !isset( $r['headers']['X-Pingback-Forwarded-For'] ) && in_array( $url, $urls ) ) {
1120                         $remote_ip = preg_replace( '/[^a-fx0-9:.,]/i', '', $_SERVER['REMOTE_ADDR'] );
1121
1122                         // Note: this assumes REMOTE_ADDR is correct, and it may not be if a reverse proxy or CDN is in use
1123                         $r['headers']['X-Pingback-Forwarded-For'] = $remote_ip;
1124
1125                         // Also identify the request as a pingback verification in the UA string so it appears in logs
1126                         $r['user-agent'] .= '; verifying pingback from ' . $remote_ip;
1127                 }
1128
1129                 return $r;
1130         }
1131
1132         /**
1133          * Ensure that we are loading expected scalar values from akismet_as_submitted commentmeta.
1134          *
1135          * @param mixed $meta_value
1136          * @return mixed
1137          */
1138         private static function sanitize_comment_as_submitted( $meta_value ) {
1139                 if ( empty( $meta_value ) ) {
1140                         return $meta_value;
1141                 }
1142
1143                 $meta_value = (array) $meta_value;
1144
1145                 foreach ( $meta_value as $key => $value ) {
1146                         if ( ! isset( self::$comment_as_submitted_allowed_keys[$key] ) || ! is_scalar( $value ) ) {
1147                                 unset( $meta_value[$key] );
1148                         }
1149                 }
1150
1151                 return $meta_value;
1152         }
1153 }